piperidin-4-yl acetate;hydrochloride

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of 2-(4-carboxybenzyl)-3-isopropylmaleic acid dimethyl ester (10.3 mg, 0.0322 mmol) in dichloromethane (500 μL) were added 1-hydroxybenzotriazole (13.3 mg, 0.0965 mmol), 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride (20.8 mg, 0.109 mol), piperidin-4-yl acetate hydrochloride (28.8 mg, 0.161 mmol) and triethylamine (14.6 mg, 0.145 mmol) with stirring under ice cooling. After stirring at room temperature for 1 h, the reaction mixture was diluted with water to separate the phases. The aqueous layer was extracted again with ethyl acetate, and the combined organic layer was concentrated under reduced pressure and the residue thus obtained was subjected to silica gel column chromatography (hexane-ethyl acetate1:2) to give 11.1 mg of the title compound as a solid (yield: 78%). After stirring at room temperature for 1 h to separate the phases The aqueous layer was extracted again with ethyl acetate the combined organic layer was concentrated under reduced pressure the residue thus obtained

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of 2-(4-carboxybenzyl)-3-isopropylmaleic acid dimethyl ester (10.3 mg, 0.0322 mmol) in dichloromethane (500 μL) were added 1-hydroxybenzotriazole (13.3 mg, 0.0965 mmol), 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride (20.8 mg, 0.109 mol), piperidin-4-yl acetate hydrochloride (28.8 mg, 0.161 mmol) and triethylamine (14.6 mg, 0.145 mmol) with stirring under ice cooling. After stirring at room temperature for 1 h, the reaction mixture was diluted with water to separate the phases. The aqueous layer was extracted again with ethyl acetate, and the combined organic layer was concentrated under reduced pressure and the residue thus obtained was subjected to silica gel column chromatography (hexane-ethyl acetate1:2) to give 11.1 mg of the title compound as a solid (yield: 78%). After stirring at room temperature for 1 h to separate the phases The aqueous layer was extracted again with ethyl acetate the combined organic layer was concentrated under reduced pressure the residue thus obtained

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of 2-(4-carboxybenzyl)-3-isopropylmaleic acid dimethyl ester (10.3 mg, 0.0322 mmol) in dichloromethane (500 μL) were added 1-hydroxybenzotriazole (13.3 mg, 0.0965 mmol), 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride (20.8 mg, 0.109 mol), piperidin-4-yl acetate hydrochloride (28.8 mg, 0.161 mmol) and triethylamine (14.6 mg, 0.145 mmol) with stirring under ice cooling. After stirring at room temperature for 1 h, the reaction mixture was diluted with water to separate the phases. The aqueous layer was extracted again with ethyl acetate, and the combined organic layer was concentrated under reduced pressure and the residue thus obtained was subjected to silica gel column chromatography (hexane-ethyl acetate 1:2) to give 11.1 mg of the title compound as a solid (yield: 78%). After stirring at room temperature for 1 h to separate the phases The aqueous layer was extracted again with ethyl acetate the combined organic layer was concentrated under reduced pressure the residue thus obtained

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of 2-(4-carboxybenzyl)-3-isopropylmaleic acid dimethyl ester (10.3 mg, 0.0322 mmol) in dichloromethane (500 μL) were added 1-hydroxybenzotriazole (13.3 mg, 0.0965 mmol), 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride (20.8 mg, 0.109 mol), piperidin-4-yl acetate hydrochloride (28.8 mg, 0.161 mmol) and triethylamine (14.6 mg, 0.145 mmol) with stirring under ice cooling. After stirring at room temperature for 1 h, the reaction mixture was diluted with water to separate the phases. The aqueous layer was extracted again with ethyl acetate, and the combined organic layer was concentrated under reduced pressure and the residue thus obtained was subjected to silica gel column chromatography (hexane-ethyl acetate1:2) to give 11.1 mg of the title compound as a solid (yield: 78%). After stirring at room temperature for 1 h to separate the phases The aqueous layer was extracted again with ethyl acetate the combined organic layer was concentrated under reduced pressure the residue thus obtained